Schedule Percentage increase of earnings factors for specified tax years
Original text. Later amendments are not shown.
| Tax year | Percentage increase |
| 1978-1979 | 1029.5 |
| 1979-1980 | 897.0 |
| 1980-1981 | 732.9 |
| 1981-1982 | 597.6 |
| 1982-1983 | 533.6 |
| 1983-1984 | 488.3 |
| 1984-1985 | 444.7 |
| 1985-1986 | 411.0 |
| 1986-1987 | 369.2 |
| 1987-1988 | 336.9 |
| 1988-1989 | 301.9 |
| 1989-1990 | 262.7 |
| 1990-1991 | 238.1 |
| 1991-1992 | 207.0 |
| 1992-1993 | 188.3 |
| 1993-1994 | 174.6 |
| 1994-1995 | 166.3 |
| 1995-1996 | 155.1 |
| 1996-1997 | 148.1 |
| 1997-1998 | 136.3 |
| 1998-1999 | 125.9 |
| 1999-2000 | 116.8 |
| 2000-2001 | 104.0 |
| 2001-2002 | 96.1 |
| 2002-2003 | 88.0 |
| 2003-2004 | 81.5 |
| 2004-2005 | 74.9 |
| 2005-2006 | 68.0 |
| 2006-2007 | 62.5 |
| 2007-2008 | 56.1 |
| 2008-2009 | 49.8 |
| 2009-2010 | 45.3 |
| 2010-2011 | 43.5 |
| 2011-2012 | 40.3 |
| 2012-2013 | 37.8 |
| 2013-2014 | 35.4 |
| 2014-2015 | 34.2 |
| 2015-2016 | 32.2 |
| 2016-2017 | 29.6 |
| 2017-2018 | 26.3 |
| 2018-2019 | 22.7 |
| 2019-2020 | 19.3 |
| 2020-2021 | 14.7 |
| 2021-2022 | 11.8 |
| 2022-2023 | 7.0 |
| |